# Incoming transfer With the **Incoming transfer** trigger, the workflow process starts when the upload of a file to a specific virtual path is completed. This trigger works both when Data Mover operates as a client or as a server. Refer to the [Data Mover client and server roles](/data-mover-1.21/transfer-protocols-and-connectors/data-mover-client-and-server-roles.md) page for details. For example, when an actor sends a file to a Data Mover server on a VFS and virtual path, upon completion of the transfer, a mediation contract (with incoming transfer) is triggered on that virtual path. The **Incoming transfer** trigger requires a virtual path. **Execution Variable** When executed, this trigger adds an execution variable named `file`, of type `FileDetail`. Its attributes are set based on the information sent from the event that initiated the trigger. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.primeur.com/data-mover-1.21/workflow-templates/triggers/incoming-transfer.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.